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Add (guix store roots).
Add (guix store roots).
* guix/store/roots.scm, tests/store-roots.scm: New files. * Makefile.am (STORE_MODULES): Add guix/store/roots.scm. (SCM_TESTS): Add tests/store-roots.scm.version-1.0.0

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3 changed files with 177 additions and 2 deletions
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;;; GNU Guix --- Functional package management for GNU |
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;;; Copyright © 2019 Ludovic Courtès <ludo@gnu.org> |
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;;; |
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;;; This file is part of GNU Guix. |
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;;; |
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;;; GNU Guix is free software; you can redistribute it and/or modify it |
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;;; under the terms of the GNU General Public License as published by |
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;;; the Free Software Foundation; either version 3 of the License, or (at |
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;;; your option) any later version. |
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;;; |
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;;; GNU Guix is distributed in the hope that it will be useful, but |
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of |
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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;;; GNU General Public License for more details. |
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;;; |
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;;; You should have received a copy of the GNU General Public License |
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>. |
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|
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(define-module (guix store roots) |
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#:use-module (guix config) |
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#:use-module ((guix store) #:select (store-path? %gc-roots-directory)) |
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#:use-module (guix sets) |
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#:use-module (guix build syscalls) |
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#:use-module (srfi srfi-1) |
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#:use-module (srfi srfi-11) |
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#:use-module (srfi srfi-26) |
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#:use-module (ice-9 match) |
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#:use-module (ice-9 regex) |
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#:re-export (%gc-roots-directory) |
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#:export (gc-roots |
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user-owned?)) |
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|
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;;; Commentary: |
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;;; |
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;;; This module provides tools to list and access garbage collector roots ("GC |
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;;; roots"). |
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;;; |
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;;; Code: |
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(define %profile-directory |
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;; Directory where user profiles are stored. |
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;; XXX: This is redundant with the definition in (guix profiles) and not |
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;; entirely needed since in practice /var/guix/gcroots/profiles links to |
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;; it. |
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(string-append %state-directory "/profiles")) |
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(define (gc-roots) |
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"Return the list of garbage collector roots (\"GC roots\"). This includes |
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\"regular\" roots fount in %GC-ROOTS-DIRECTORY as well as indirect roots that |
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are user-controlled symlinks stored anywhere on the file system." |
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(define (regular? file) |
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(match file |
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(((or "." "..") . _) #f) |
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(_ #t))) |
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|
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(define (file-type=? type) |
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(match-lambda |
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((file . properties) |
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(match (assq-ref properties 'type) |
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('unknown |
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(let ((stat (lstat file))) |
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(eq? type (stat:type stat)))) |
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(actual-type |
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(eq? type actual-type)))))) |
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|
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(define directory? |
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(file-type=? 'directory)) |
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|
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(define symlink? |
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(file-type=? 'symlink)) |
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|
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(define canonical-root |
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(match-lambda |
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((file . properties) |
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(let ((target (readlink file))) |
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(cond ((store-path? target) |
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;; Regular root: FILE points to the store. |
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file) |
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|
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;; Indirect root: FILE points to a user-controlled file outside |
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;; the store. |
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((string-prefix? "/" target) |
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target) |
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(else |
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(string-append (dirname file) "/" target))))))) |
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|
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(let loop ((directories (list %gc-roots-directory |
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%profile-directory)) |
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(roots '()) |
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(visited (set))) |
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(match directories |
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(() |
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roots) |
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((directory . rest) |
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(if (set-contains? visited directory) |
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(loop rest roots visited) |
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(let*-values (((scope) |
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(cut string-append directory "/" <>)) |
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((sub-directories files) |
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(partition directory? |
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(map (match-lambda |
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((file . properties) |
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(cons (scope file) properties))) |
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(scandir* directory regular?))))) |
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(loop (append rest (map first sub-directories)) |
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(append (map canonical-root (filter symlink? files)) |
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roots) |
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(set-insert directory visited)))))))) |
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|
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(define* (user-owned? root #:optional (uid (getuid))) |
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"Return true if ROOT exists and is owned by UID, false otherwise." |
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;; If ROOT is an indirect root, then perhaps it no longer exists. Thus, |
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;; catch 'system-error' exceptions. |
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(catch 'system-error |
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(lambda () |
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(define stat |
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(lstat root)) |
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|
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(= (stat:uid stat) uid)) |
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(const #f))) |
@ -0,0 +1,53 @@ |
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;;; GNU Guix --- Functional package management for GNU |
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;;; Copyright © 2019 Ludovic Courtès <ludo@gnu.org> |
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;;; |
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;;; This file is part of GNU Guix. |
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;;; |
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;;; GNU Guix is free software; you can redistribute it and/or modify it |
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;;; under the terms of the GNU General Public License as published by |
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;;; the Free Software Foundation; either version 3 of the License, or (at |
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;;; your option) any later version. |
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;;; |
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;;; GNU Guix is distributed in the hope that it will be useful, but |
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of |
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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;;; GNU General Public License for more details. |
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;;; |
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;;; You should have received a copy of the GNU General Public License |
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>. |
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|
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(define-module (test-store-deduplication) |
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#:use-module (guix tests) |
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#:use-module (guix store) |
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#:use-module (guix store roots) |
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#:use-module ((guix utils) #:select (call-with-temporary-directory)) |
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#:use-module (srfi srfi-1) |
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#:use-module (srfi srfi-64)) |
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|
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(define %store |
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(open-connection)) |
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(test-begin "store-roots") |
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(test-assert "gc-roots, regular root" |
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(let* ((item (add-text-to-store %store "something" |
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(random-text))) |
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(root (string-append %gc-roots-directory "/test-gc-root"))) |
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(symlink item root) |
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(let ((result (member root (gc-roots)))) |
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(delete-file root) |
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result))) |
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|
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(test-assert "gc-roots, indirect root" |
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(call-with-temporary-directory |
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(lambda (directory) |
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(let* ((item (add-text-to-store %store "something" |
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(random-text))) |
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(root (string-append directory "/gc-root"))) |
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(symlink item root) |
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(add-indirect-root %store root) |
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(let ((result (member root (gc-roots)))) |
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(delete-file root) |
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result))))) |
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|
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(test-end "store-roots") |
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